She said Tullus, a Waltham resident, told her Monday he was going out.

“He’s a good guy, he’s not in trouble,” Jean-François said.

Tullus’ 15-year-old sister Laurie Pierre said they didn’t know how or why Tullus died. She said investigators told the family they would “let them know.”

“We were looking for our brother for two days,” Pierre said. “Yesterday, we went to the station and my dad left to go to work and saw my brother’s car. The police went up and they found my brother’s body hanging out of the back [seat] of the car.”

Police responded to the area at about 3 p.m. Wednesday.

A neighborhood resident on Thursday said no one seemed to know what was going on Wednesday until police showed up and taped off the area.

Overland Road – about 1,000 feet long – runs parallel to Main Street and is mostly residential. It's common for cars to be parked on the street, according to the neighbor.

Jean-François and her family live close to where the car was found and Pierre said it was a trying time.

“People are crying in the house and it’s just terrible,” Pierre said.

Officials have remained silent about the incident other than saying investigators are looking into an “unattended death.” Waltham Police have referred all questions to the Middlesex District Attorney’s Office.